It is a product used in the grout filling method among the rebar joint methods
used in the precast concrete construction method.
In recent years, as buildings become larger and higher-rise, high-strength reinforcing
bars are required, and products suitable for SD600 high-strength reinforcing bars
are being produced and delivered.
Sleeve sizes are developed up to D16, D19, D22, D25, D29, D32, D35, and D38.

It is a core product used for segmentation used in TBM (Tunnel Boring Machine),
a method of tunneling.